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@ckit Playing video and editing video are two completely different beasts. Most likely you'll need to transcode your source into something more editing- and HitFilm-friendly.

Before getting into that, though, it would help to know more about your source material. If you would, install MediaInfo, drag one of your camera clips into it, then copy the details from the Text View and paste them in a reply here.

Thanks. I'm no wizard at analyzing these details like some others here, but I do see that the file uses the AVC codec, which can apparently cause problems in HitFilm unless it's set up just right. I recommend diving into this thread, which will provide instructions on how to transcode your footage into something more HitFilm-friendly:

@jsbarrett@ckit Not being able to import at all is probably because of the audio. Uncompressed PCM audio in an MP4 makes an out of spec file. It's a case of just because something can be done, doesn't mean it should be done. Following @NormanPCN 's steps will fix it because it will compress the audio to a format that's "legal" for an MP4 and give you a video that's going to be easier to edit.

My understanding is that HitFilm can take uncompressed audio in the right situations. To quote what @Aladdin4d said above (with my own added emphasis), "Uncompressed PCM audio in an MP4 makes an out of spec file." Uncompressed PCM audio in a different container might work just fine. Just because someone put uncompressed audio into an MP4 and it may work in some media players doesn't mean that it's following proper specs, and HitFilm is pretty picky (from what I understand) about file specs.

Unfortunately if I need to perform a conversion of all my video files before I can import, I may need to look at alternative products as this extra step is going to significantly increase editing time.